Radeon RX 7900 XT PCB Design leaks, reveals AMD's chiplet design, VRAM configuration and power specs

AMD's RDNA 3 flagship is going to be huge

Radeon RX 7900 XT PCB Design leaks, reveals AMD's chiplet design, VRAM configuration and power specs

It looks like AMD's Radeon RX 7900 XT will feature seven chipets, 24GB of memory, and a maximum power draw of 450 watts

Igor Wallossek from Igor's Labs has released an "exclusive" look at AMD's Radeon RX 7900 XT PCB design, revealing giving us a look at what's likely to be AMD's RDNA 3 GPU flagship.

AMD did showcase an RDNA 3 graphics card running Lies of P at their recent Ryzen 7000 series reveal stream (more information on that here), but AMD did not reveal any concrete information about their next-generation graphics cards that we didn't already know. Thankfully, Igor's leaks have given us a lot to talk about, from the GPU's power configuration, to its VRAM capacity, memory bus size, and chiplet-based design. 

Below, we can see that AMD's RDNA 3 GPU core uses seven chiplets, six smaller chiplets, which are expected to be memory controller chiplets, and a larger chiplet that is expected to be AMD's compute/graphics die. 

Based on the VRAM chips and chiplet design shown below, AMD's RDNA 3 flagship is expected to feature a 24GB frame buffer that uses twelve 2GB (16Gb) GDDR6 modules over a 384-bit memory bus. This memory bus is divided over six chiplets, each of which controls two GDDR6 DRAM chips over a 64-bit memory bus. 

Radeon RX 7900 XT PCB Design leaks, reveals AMD's chiplet design, VRAM configuration and power specs

Below we can also see that AMD's alleged RX 7900 XT design uses three 8-pin (6+2-pin) PCIe power connectors, giving this GPU a maximum power draw of 450W using these three connectors. AMD does not appear to be adopting the 12+4-pin (16-pin 12VHPWR) PCIe 5.0 power connector with their standard RX 7900 XT models, though it is possible that some models will feature such a power connector.

The PCB image above suggests that AMD's RX 7900 XT will feature three DisplayPort outputs and a single HDMI 2.1 output. It looks like AMD is ditching USB Type-C display connectors with this release. 

With RDNA 3, AMD has stated that they can deliver power efficiency (performance per watt) increases of over 50% when compared to RDNA 2. AMD's RDNA 3 GPUs will feature re-architected compute units, next-gen Infinity Cache, an optimised graphics pipeline, and enhanced ray tracing capabilities (more information here). With all of this in mind, AMD's RDNA 3 graphics cards should represent a major step forward from AMD, which is great news for high-end consumers and the GPU market at large.

You can join the discussion on AMD's Radeon RX 7900 XT PCB leak on the OC3D Forums.

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Most Recent Comments

15-09-2022, 14:21:25

AlienALX
Awesome. So this must be the big boy.

Good they are sticking to standard connectors and not forcing you to use an ass whart for power.Quote

15-09-2022, 15:00:54

Bagpuss
Unless RT performance can at least match the 4xxx series, which I severely doubt, then AMD won't even enter into my consideration for my next GPU.


I think the best we can hope for is that they match the 3xxx cards, or slightly exceed them, in that department.


Its a shame, as I really don't want to give Nvidia any more of my money but I equally don't want to have to turn down the settings knowing I wouldn't have to if I'd stuck with Nvidia.Quote

15-09-2022, 16:02:31

Warchild
Quote:
Originally Posted by AlienALX View Post
Awesome. So this must be the big boy.

Good they are sticking to standard connectors and not forcing you to use an ass whart for power.
Nothing wrong with the new connector. I like the idea of one vs three. Its the ass-position they keep putting it in right now, that I have problems with.

Why oh why would you put the connector in the middle of the card, right where the cable etc is in full view, and most likely covering any text/design...Quote

15-09-2022, 18:29:03

KingNosser
I honestly feel these cards will either break even or trounce, but just like Nvidia AMD is going to want a pretty penny for them, if they do keep pricing similar to before then Nvidia you got problems i feel as AMD have much more TSMC capacity.

I expect the DXR performance will be improved but by how much anyone can guess, saying that i'll be on my 6800xt for at least one or two more gens yet at which point 3nm or lower will be a reality and beyond that chiplet is the only way.

Do feel Nvidia are going to be in a pickle unless they sort that out sharpish.Quote

15-09-2022, 19:15:37

AlienALX
This one will be a pretty penny, yes. Because of materials, and AMD's increase in profit margin since Polaris. Where Raja had the superb idea of a land grab. Sadly when he left his good ideas left with him, and AMD got greedy.

It's not this one you want to be interested in. It's the smaller, potentially much cheaper, mid range cards.Quote
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